#53 stepperview, #56 checkboxes #47 textfieldview

#53: slider view replaced with StepperView
![ios simulator screen shot 13-oct-2013 1 47 02 am](https://f.cloud.github.com/assets/648813/1320813/54b0dcce-337d-11e3-8bbd-0ca7034d9554.png)

#56: Check box used instead of numbers and also text labels on right and left end added.
![ios simulator screen shot 13-oct-2013 1 47 36 am](https://f.cloud.github.com/assets/648813/1320814/805383f4-337d-11e3-8f60-2147a4c6e4e5.png)

#47:
![ios simulator screen shot 13-oct-2013 1 47 48 am](https://f.cloud.github.com/assets/648813/1320815/8e5e2346-337d-11e3-87c5-ff7b29dfd1c0.png)

@Yiming: I've merged the three fixes in the same pull request as they all had code fixes in the PacoQuestionView class.